Go to Celadon City. Behind the Pokemon Center there is a small opening between two bushes. Go to the left of the opening and you'll be able to enter a building. Enter the first building on the left with the two bushes at the entrance. Inside there will be numerous stairs. On the last floor there will be a room with a board and a Pokeball on the desk. Inside the ball you'll find Eevee.
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Ive hear my friends say that in Pokemon yellow you can evolve eevee in a espeon with a moon stone
give it a thunderstone
You can't find Eevee in Pokemon Ruby, but you can trade for it from Fire Red, Leaf Green, and XD.
nah there isnt, butu get him later on in the game
You don't. You have to trade an eevee to Pokemon Ruby to use one in the game.